luttropp



Sept. 15, 1931. c. LUTTROPP 1,823,552

CALCULATING MACHINE I Sheets-Sheet 1 Filed March 30, 1926 IIIIIIIIIIIII I /v VE/V 7'04 v y Jr a WM 4/; Arrazwvs Y Sept. 15, 1931. c. LUTTROPP CALCULATING MACHINE 1926 3 Sheets-Sheet 2 Filed March 30 Sept. 15, 1931. Q LUTTROPP 1,823,552

CALCULATING MACHINE Filed March 30, 1926 3 Sheets-Sheet 3 .ZNve yrae w/ Patented Sept. 1 5, 1931 i UNITED STATES PATENT OFFICE CONRAD LUTTROPP, OF

STOCKHOLM, SWEDEN, ASSIGNOB OF ONE-HALF TO ANDRES LINDAHL, OF STOCKHOLM, SWEDEN CALCULATING MACHINE Application filed larch 30, 1926, Serial No. 98,611, and in Sweden Iarch 30, 1925.

The present invention relates to calculating machines and especially to ten-key-operated calculating machines, that is to say to such machines in which only one key is provided for each figure and in which the figure set up is'arranged in the number by means of a selector, that is to say a device which, on setting up a number in the machine, collects-the different figures and arranges them in the right places in the number and then transmits the number set up onto the main counting register.

The principal object of the present invention is to provide a calculating machine of the type above referred to having indicating mechanism for, showing the number set, which is positive and accurate in action, simple of construction, involving a minimum of structural parts, capable of showing the character set up immediately upon key actuation and capable of direct resetting for correction.

The chief feature of the invention consists in the provision in calculating machines having a selector and a plurality of keys for operating said selector, of an indicator for showing thenumber set up in said selector and comprising a plurality of movable members provided with figures, means to operatively connect said selector with said indicator so as to efiect stepwise movement of the latter in. conformity with the movementof the selector, and means actuated by the keys and adapted to move one of said members at a time so as to make that figure thereof visible which corresponds to the key just operated.

According to one preferred embodiment said indicator comprises a carriage and a plurality of lengthened members, for instance vertical racks. slidably mounted in said carriage and each engaging a disk, for instance a toothed disk, provided with figures.

The invention further comprises stopping means actuated by the keys for limiting the movement of the member or rack actuated by the operated key so as to make that figure of the corresponding disk visible which corresponds to the key just operated, means to maintain the actuated member or rack in set position, means to return the indicator as a -whole into starting position and to restore selector into starting position, the invention also comprises means to connect the indicator with said correcting key so as to cause said indicator to return step-by-step into starting position on pressing down the correcting key.

The invention further comprises several other features for securing a safe operation of the indicator, as will be more fully described in the following description with reference to the accompanying drawings.

The invention is illustrated in the accompanying drawings in which an embodiment of the same is shown by way of example as appliedto a ten-key-operated calculating machine.

Fig. 1 is a plan view of the calculating machineprovided with an indicator according to the present invention.

Fig. 2 is a front elevation of said indicator, the casing of the machine being partly broken away. a v

Fig. 3 is a side view showing the driving connection between the indicator and the selector and that between the keys and the stopping means for the indicator, the casing of the machine being partly broken away.

Fig. 4 is a side view showing the correct.- irlg key in depressed position.

Fig. 5 shows a member of the indicator in i set position.

Referring to the drawings, 1 designates the key board, 2 the selector gear wheel and 3 the driving sector secured to the pin 4 which may be operated by the machine operating handle. 5, 5 are connectin links between the keys and the selector. he seelctor gear lCal wheel 2' meshes with a pinion 6 connected with a bevel gear wheel 7 engaging another bevel gear wheel 8 secured to the shaft 9. At its 1 other end said shaft 9 carries a gear wheel 10 provided with oblique teethand meshing with the rack 11 which is secured to the carriage 12 of the indicator, said carriage being slidably mounted on the guide 13.

The selector gear wheel 2'is a part of the main calculating mechanism, explanation of V which is herein omitted in order to more clear- 1y describe the indicating mechanism and because the indicating mechanism is notlimited to a given calculating mechanism or machine. The type of machine which I prefer and of which selector gear wheel 2 is an element is shownand described in my United States application Serial No. 657,148, filed August 13, 1923, U. S. Patent No. 1,662,526, dated March 13, 1928, my Swedish Patent No. 61,525 and my British Patent No. 240,889.

The indicator consists of a plurality of disks 14 provided on their circumference with figures and rotatably mounted on a shaft 15. Each of said figure wheels 14 carries a pinion 16 meshing with a rack 17 guided in a vertical slot in the carriage 12. Mounted on the machine frame below the indicator is a guide plate 18 provided withguiding openings for stop pins 19, each of which is connected at its one end with one of the links 5.

. The stop pins 19 are disposed vertically above one another and spaced at a distance correspondingto the distance between the figures on the figure wheels 14'. 9

'Above the indicator is a lever 20 pivotally mounted on the frame of the machine as at 21 and provided at its free end with a in 22. Pivotally mounted on said pin 22 is a oublearmed lever 23, connected at itsone end with the machine frame by means of a spring 24 and formed at its other end as a hammer 25.

' When the indicator occupies its starting position, the hammer 25 is right above the first rack 17. A link 26 connects the lever 20- with one end of an angular lever 27 journalled on the frame, and another link 28 connects the other end of said angular lever 27 to a lever 29 journalled on the frame and connected with all key links 5at its other end..

In the starting position the racks 17 except that one which is in turn to be operated rest against an arm 34 integral with and extending perpendicularly to a double-armed lever 35 journalled in the frame ona pin 36 and carrying an abutment 38 on the same side of the said pin 36 as the arm 34. Arm 34 extends-to the left in Figs. 1 and 2 (as shown) as far .as the right hand edge of the upper rearwardly projecting part of the pawl 30. Rotatably mounted on the same pin 36 is a lever 39 provided with an abutment 37 which, in the starting position, engages a set-screw 47 screwed into the frame. The driving sector 3 in its end positions abuts against 7 25. The pawl 30 is moved by the releasing rod 32 which is journalled in the guide plate 18 and is connected at its opposite end to the lever 29. On the same level as the upper edge of the pawl 30 and extending in alignment with said edge is a horizontal guide plate 33 which is secured to the frame.

At the end of the lever 39 is a pin 40, and pivotally mounted on said in 40 is-a link .41, the other end of which is pivotally connectedto another link 42, which, at its opposit end, is pivotally connected to the lever 35, a pin 43 on the link 42 engaging a slot in the lever 35. At the joint of the links 41 and 42 is pivotally connected a link 44, which, at its opposite end, is connected with the cor recting key 46 by means of the angular liver journalled in the frame of the mac me.

The operation of the indicator is as follows On pressing down a given key on the key board 1, the selector is operated as described in my ap lication and patents aboveidentified by one o the links 5 and projects that stop pin 19 which is connected to the particular llllk which is moved and which corresponds to the key pressed down. Simultaneously the link 5 engages and turns the lever 29 which by the hammer. Rack 17 then has free pas sage -downwardly until .it is stopped by the stop pin 19 whichcorresponds to the given key which has been depressed and which stop'pin has been projected forwardly lnto the path of the descending rack. The rack 17 will then rotate the corresponding figure disk 14 by so great a number of steps as will be permitted by the stop pin 19, so that the figure wheel will show the figure corresponding to the key pressed down. As soon as the hammer 25 has pressed down a rack 17 into 'contact with the projected stop pin 19, the sprin 24 will take up any remaining movement 0 the lever 20. When the key returns, the lever 29 will return into its starting position and will then first pull back the releasing rod 32, so that the pawl 30 is caused to engage the rack 17 and maintain it in the pin 19 will return into its starting set position. Until the pawl 30 engages the rack 17, the hammer 25 is pressed against said rack 17 by means of the spring 24, but at the termination of the returning movement of the key, the hammer is released by means of the parts 28, 27 and 26. At the same time as the pawl 30 engages the rack 17 the stop position due to its connection with the key link Finally, the return of the key will in known manner cause the selector to move one step, said movement of the selector being transmitted to the carria e 12 of the indicator by means of the gear w eels 6, 7, 8 and 10 and the rack 11, so that said carriage 12 will be moved one step to the left, whereb the figure which has just been set will be visible through a window 48 arranged in the casing of the machine, and the next rack 17 together with the corresponding figure disk will be brought right before the row of stop pins 19 and the hammer 25. Durin this lateral movement the tooth space 0 the rack 17 which previously was in engagement with the pawl will be brought into engagement with the guide plate 33.

position will be maintained in place. In this manner, consecutive operations may be performed, until all racks 17 and figure disks connected thereto have been moved up on theguide late 33 and have been made visible through the window 48, that is to say until the full capacity of the machine has been utilized.

On transferring the number set up in the.

- racks 17 toward t 6, right will be left free.

When the arm 34 occupies its lowered position, the racks 17 which have not been actuated are held up by'means of a stop member 34' secured to theframe of the machine. Sto member 34' is pivoted at its lower end to the machine frame and has, at its upper ,end, a rearwardly projecting ridge which normally extends into lower notches of the racks which have not been lowered. The rearwardly projecting ridge is so formed that it prevents downward movement of the racks which it enga es but permits upward past the same. This wardly. Member 34 is thus a pawl which permits a toothed member to move upwardly past the same but prevents its downward movement. On ,the return stroke of the toothed sector 3 the lever 35 will remain in its'lowe'red position due to its own weight.

uently, the rack is now locked so that the gure disk set in On said return stroke the selector will in known manner he returned to starting position, the indicator being also returned into its starting by means 0 the parts 6, 7, 8, 9, 10 and 11. When the return movement of the toothed sector 3 is terminated it will strike the abutment 37, the arm 35 being then returned into starting position by means of the lever 39 and links 41 and 42, said arm 35 thereby causing arm 34nd W1 30 to lift the racks 17 into starting position, so that the figure disks will be zeroized.

When a number has been set up in the manner described above, it being desired, how-- ever, to correct the latest figure set up, said figure is zeroized in the selector as explained in my patents above referred to by presing down the correcting key. On depressing the correcting key, said key will actuate, b means of the angular lever and-the lin 44, the toggle formed by the links 41 and 42 in such a manner that the lever 35 will turn around the in 36, so that the arm 34-and the pawl 30 wi I be lowered. On continued depression of thecorrecting key the selector will in known manner be returned one step, causing a movement of the indicator one step to the right. On the return of the correcting key the to gle 41, 42 will be straightened by means 0 the parts 45 and 44, and the pawl 30 will then lift up the rack- 17 last pressed down into the zero position. If

it is desirable to correct a preceding figure,

the process 'ust described is repeated, until the desired figure is reached.

Evidently the invention is not limited to the embodiment shown nor to the type of cal-v culatin machines illustrated, but may be applie to calculating machines provided with a selector of any type.

-What I claim is 2-- 1. In calculating machines having a selector and 'a plurahty of keys for operating said selector, an indicator for showing the number set up in said selector, said indicator com risin a carriage, a plurality of lengthene mem rs slida ly mounted on said carria e, a set of disks provided with figures eac arranged to be engaged by a lengthened member,'means to o ratively connect said selector with said indlcator so as to effect stepwise movement of the indicator in conformity with the movement of the selector, means adapted to longitudinally move one of said members at a time, said means being actuated by the keys and comprising a resiliently mounted hammer, and stopping means actuated b the keys for limiting the movement of sai member.

2. In calculating machines having a selector and a plurality of keys for operating said selector, an indicator for showing the number set up in said selector, said indicator comprising a carriage, a plurality of vertical 55 I eratively connect said selector with said inlengthened members slidably mounted on said carriage, a set of disks provided with figures each arrangedto be engaged by a lengthened member, means to operatively connect said 5 selector with said indicator to effect horizon-- said selector, an indicator for showing the number set up in said selector, said indicator comprising a carriage, a plurality of racks slidably mounted on saidcarriage, a set of disks tprovided with circumferentially 'dis-. posed gures each arranged to be engaged by a rack, means to operatively connect said selector with said indicator to effect horizontal stepwise movement of the indicator in conformity with the movement of said selector, means actuated by the keys and adapted to move one of said racks at a time, stopping means actuated by the keys for limiting the movement of said racks and a locking memto maintain actuated racks in set position. 4:. In calculating machines having a machine frame, a selector and a plurality of keys for operating said selector, an indicator for showing the number set up in said selector, said indicator comprising a carriage, a plurality of vertical racks slidably mounted in said carriage, a set of disks provided with .rack, means to operatively connect said selector withsa'id indicator to. effect horizontal stepwise movement of the indicator in conformity with the movement of said selector, means actuated by the keys and adapted to vertically and longitudina-llymove'one of said racks at a time, stopping means actuated All racks, an a guiding plate secured to the ma chine frame and adapted to maintain ated racks in set position.

5. In calculating machines having a machine frame, a selector and a plurality of 4 keys for operating said selector; an indicator for showing the number set up in said selector andcomprising a plurality of movable members provided with figures, means to opdicator to effect stepwise movement of the indicator in conformity with the movement of said selector, means actuated by the keys and adapted to move one of said members at a time, said last-mentioned means comprising a lever pivotally mounted at one end on the machine frame and actuated by the keys, another lever pivotally connected to the free end of the first-mentioned lever, a spring conber adaptedto engage the racks successively figures each arranged to beengaged by av member in set it ft by the ke s for l1m1t1ng the movement of the POS Ion 3 er movement actunecting one end of said last-mentioned lever with the machine frame and a hammer provided at the other end of said lever, and stopping means actuated by the keys for. limiting the movement of said members.

6. In calculating machines having a selector and a plurality of keys for operating said selector, an indicator for showing the number set up in said selector, said indicator comprising a carriage, a plurality of members slidably mounted on said carriage, a set of disks provided with figures, each arranged to be engagedby one of said members, means to operatively connect said selector with said indicator so as to eifect stepwise movement of the indicator in conformity with the movement of the selector, means actuated by the keys and adapted to move one of said members at a time, stopping means actuated by the keys for limiting the movement of said member, said stopping means comprising a single row of sliding stop pins each connected with one of the keys.

7.1n calculating machines having a selector and a plurality of keys for operating said 90 selector, an indicator for showlng the number set up in said selector and comprising a plurality of vertically movable rack members, diC'CS operated by said members provided with figures, means to operatively connect said selector with said indicator so as to effect stepwise movement of the indicator in con- 8. In calculating machines having a machine frame, a selector and a plurality of keys for operating said selector, an indicator forshowing thenumber' set up in said selector, said indicator comprising'a carriage, a plurality of racks slidably mounted on said carriage, 'a'set of disks-provided with figures each arranged to be engaged by a rack, means to operatively connect said selector with said indicator so as to effect stepwise movement of the indicator in conformity with the movement of the selector, means actuated by the keys and adapted to move one of said racks at a time, a spring-actuated pawl engaging the rack in turn to be operated and adapted to be actuated by the keys "so as to release said rack during the movement thereof, stopping means actuated by the keys for limiting the movement of the racks' and a guiding plate secured to the machine frame and adapted to 0 maintain the racks in set position after movement.

9. In calculating machines having a driv- I ing shaft, a selector operated by said shaft and a-plurality of'keys for. operating said selector, an indicator for showing the number set up in the selector and comprising a plurality of movable vertical lengthened members, a series of disks provided with figures, each arranged to be engaged b a lengthened member, means to operative y connect said selector with said indicator to efiect stepwise movement of.the latter in conformity with the'movement of the selector, means actuated by the keys and adapted to move one of said vertical members at atime, means for supporting the lower ends of said members, means to lower and raise said supporting means by rotation of the driving s means to sustain some of said members when said supporting means is lowered.

10. In calculatin machines having a machine frame, a driving shaft,-a selector operated by said shaft and a plurality of keys for operating said selector, an indicator for showing the number set up in the selector and comprising a plurality of movable vertical lengthened members, a series of disks provided with figures, each arranged to be engaged by a lengthened member, means to operatively connect said selector with said indicator to efiect horizontal stepwise movement of the indicator in conformity with the movement of the selector, means actuated by the keys and adapted to displace one of said members at a time, means to support the.

lower ends of the undisplaced vertical members, retaining means for the undisplaced vertical members, a lever ivotally mounted on the machine frame and driving shaft, and said supporting means being connected with said lever, the arrangement being such as to cause said supporting means to be temporarily removed from some of said members on the return of the indicator into starting position, and then to be returned into contact therewith 11. In calculating machines having a selector, a plurality of keys for operating said selector and a correcting key for returning the selector step-by-step into starting position,

an indicator for showing the number set up in the selector comprising a vplurality of movable indicator members, means to operatively connect said selector with said indicator so as to effect stepwise movement of the indicator in conformity with the movement of the selector and means actuated by the keys adapted to move one of said members at a time to register numbers in the indicator including a releasing member operable by the keys and means operated by said correcting keydncluding said releasing member for returning the last-moved indicator member to zero position.

aft and actuated by the b 12. In calculating machines having a' selector, a plurality of keys for o erating said selector and a correcting key fhr returning the selector step-by-step' into starting position, an indicator for showing, the number set up in the selector comprising a'plurality a time to register numbers in the indicator.

including a releasing member operable by the keys and means operated by said correcting key including said releasing member for'returning the last-movedjindicator member to zero position, and means to simultaneously zeroize the indicator members.

13. In calculating machines having a selector, a plurality of keys for 0 rating said selector and a correcting key Edireturning the selector step-by-step into starting position, an indicator for showing the number set up in the selector and comprising a plurality of movable vertical members, means to operatively connect said selector with said indicator so as to effect stepwise movement of the indicator in conformity with the movement of the selector, means for supporting the lower ends of the undisplaced members,

move one of said members at a time, means to connect the indicator with said correcting key so as to cause said indicator to return step-by-step into starting position upon manipulation of said correcting key, and means to connect said supporting means with said correcting key so as to zeroize said memrs. 14. In calculating machines having a selector, a plurality of keys for operating said selector and a correctingkey for returning the selector step-by-step into starting position, an indicator for showing the number set up in the selector and comprising a plurality of movable vertical members, means to operatively connect said selector with said indicator so as to effect stepwise movement of the indicator in conformity with the movementjof the selector, means for supporting the lower ends of the undisplaced members, means actuated by the keys and adapted to move one of said members at a time, means to connect the indicator with said correcting key so as to cause said indicator as a whole to return step-by-step into starting position upon manipulation of' said correcting key, and means to connect said supporting means with said correcting key and means for sustaining some of said members so asto cause said su porting means to be temporarily released iireturning movement of the indicator, and thento be returned in contact with the mem om some of said members during the means actuated by the keys and adapted to 4 her last actuated which is thereby zeroized, on the returning movement of said correcting key.

v 15. In calculating machines comprising a selector mechanism anda plurality of keys for operating the selector mechanism, the combination therewith of an indicator comprising a carriage, a plurality of longitudinally movable members mounted on said cared thereto.

16. In calculating machines comprising a selector mechanism and a plurality of keys for operating the selector mechanism, the combination therewith of an indicator comprising a carriage, a pluralityof movable members mounted on said carriage and operative to indicate characters set up, an impact element, means to actuate the impact element in response to actuation of the keys, means tomove the carriage relative to the impact element to successively place said movable members in position for a ctuation by the impact element and means interposed in the path oftravel given to the movable members by actuation of the impact element to'arrest differentially movement of the movable members.

17; In calculating machines comprising a frame, a selector mechanism and a plurality of keys for operating the selector mechanism, the combination therewith of an indicator comprising a carriage, a plurality of movable members mounted on said carriage and operative to indicate characters set up, a force applying devicepivotally mounted on said frame, means to actuate the force applying device in response to actuation of the keys,

means to move the, carriage relative to the force applying device to successively place said movable members in position for actuation by the force applying device and means interposed in the path of travel given to the movable members by actuation of the force applying device to arrest difl'erentially movement of the movable members.

- 18. In calculating machines comprising a frame, a selector mechanism and a plurality of keys for operating the'selector mechanism, the combination therewith of an indicator comprising a carriage,-a plurality of movsaid frame, means to actuate the force appl ing device in' response to actuation of t e aeaaesa keys, means to move the carriage relative to the force applying device to successively place said movable members in position for actuation by the force applying device and a series of stops adapted to be selectively interposed in the path of travel given to the movable members by actuation of the force applying device to arrest movement of the movable members.

19. In calculating machines comprising a frame, a selector mechanism and a plurality of keys for operating the selector mechanism, the combination therewith of an indicator comprising a carriage, a plurality of movable members mounted on said carriage and operative to indicate characters set up, a force applying device pivotally mounted on said frame, means to actuate the force applying device in response to actuation of the keys, means to move the carriage relative to the force applying device to successively place said movable members inposition for actuation by the force applying device and a series of stops independently actuatable by different keys adapted to be interposed in the path of travel given to the movable members upon actuation thereof by the force applying device to arrest movement of the movable members to correspond with characters set up.

20. In calculating machines comprisi'nga frame, a selector mechanism and a plurality of keys for operating the selector mechanism, the combination therewith of an indicator comprising a carriage. a plurality of longi tudinally movable straight racks mounted on said carriage, a series of sight members cor- 1 responding-to diiierent racks and actuated thereby to indicate characters set up, a force applying device mounted on said frame,

means to actuate the force applying device in response to actuation of the-keys and means to move the carriage relative to the force applying device to successively place said racks in position for actuation by the force applying device, said force applying device being arranged to successively exert pressure against the ends of the racks. I

21. In calculating machines comprising a frame. a selector mechanism and a plurality of keys for operating the selector mechanism,

the combination therewith of an indicator comprising a carriage. a plurality of longitudinally movable straight racks mounted on said carriage, a series of sight members corresponding to different racks and actuated thereby to indicate characters set up, a force applying device mounted on said frame, means to actuate the force applying device in response to actuation of the keys, means to move the carriage relative to the force applying device to successively place said racks in position for actuation-by the force applying device and means interposed in the path of travel given .to the racks upon, actuation thereof by the force applying device to aractuation of the keys. means to move the carriage relative to the force applying device to successively place said racks in position for actuation by the force applying device and a series of stops actuata-ble individually by dilferentkeys and adapted to be interposed in the path of travel of the racks upon actuation thereof by the force applying device to arrest movement of the racks in accordance with characters setup. a i

23. In calculating machines comprising a frame, a selector mechanism and a plurality of keys for operating the selector mechanism, the combination therewith of an indicator comprising a carriage, a plurality of longitudinally movable straight members mounted on said carriage and operable to "indicate characters set up, a series of Ionsaid stops.

gitudinally movable straight stops arranged in line in said frame, means to move the carriage relative. to the line of stops to successively align said' movable members with the stops, means to actuate the stops selectively in accordance with actuation of the keys and versely to the line of stops to successively align said movable members with the stops, means to actuate the stops selectively in accordance with actuation of the keys and means mounted on the frame to move said movable members against said stops.

26. In calculating machines comprising a frame, a selector mechanism, and a plurality of keys for operating the selector mechanism, the combination therewith of an indicator comprising a carriage, a plurality of movable members comprising racks mounted on said carriage and operable to indicate characters set up, a series of stops arranged in line in said frame, means to move the carriage relative to the line of stops to successively align said racks with the stops, means to actuate the stops selectively in accordance with actuation of the keys and means to move said movable members against said stops. l

In testimony whereof I afiix my'signature.

CONRAD LUTTROPP.

means to move said movable members against 24. In calculating machines comprising a frame, a selector mechanism and a plurality" of keys for operating the selector mechanism, the combination therewith of an indicator comprising a carriage, a plurality of movable members mounted on said carriage and operable to indicate characters set up, a series of stops arranged in :line in said frame, means to move the carriage relative to the line of stops to successively align said movablemembers with the stops, means to actuate the stops selectively in' accordance with actuation of the keys and impact mechanism actuated by the keys to move said movable members against said stops. I

25. In calculating machines comprising a frame, a selector mechanism and a plurality of keys for operating the selector mechanism, w

the combination therewith of an indicator comprising a carriage, a plurality of longitudinally movable straight members mounted on said carriage and operable to,indicate characters set up, a series of longitudinally movable straight stops'arran'ged in line in said frame, means to move the carriage trans- 

